body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f6;
    color: #333;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    width: 90%;
    max-width: 800px;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    color: #2c3e50;
    margin-bottom: 10px;
}

header p {
    color: #7f8c8d;
}

.card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    padding: 30px;
    margin-bottom: 20px;
}

.hidden {
    display: none;
}

.input-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}

textarea {
    width: 100%;
    height: 100px;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    resize: vertical;
    box-sizing: border-box;
}

input[type="file"] {
    display: block;
    margin-top: 5px;
}

.divider {
    text-align: center;
    margin: 20px 0;
    color: #999;
    position: relative;
}

.divider::before, .divider::after {
    content: "";
    position: absolute;
    top: 50%;
    width: 45%;
    height: 1px;
    background: #ddd;
}

.divider::before { left: 0; }
.divider::after { right: 0; }

.primary-btn {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    width: 100%;
    transition: background-color 0.3s;
}

.primary-btn:hover {
    background-color: #2980b9;
}

.primary-btn:disabled {
    background-color: #bdc3c7;
    cursor: not-allowed;
}

#progress_container {
    background-color: #ecf0f1;
    border-radius: 20px;
    margin: 20px 0;
    overflow: hidden;
}

#progress_bar {
    width: 0%;
    height: 30px;
    background-color: #2ecc71;
    color: white;
    text-align: center;
    line-height: 30px;
    transition: width 0.5s ease;
}

#status_text {
    text-align: center;
    color: #34495e;
}

.success-msg {
    color: #27ae60;
    text-align: center;
    font-weight: bold;
    font-size: 18px;
}

.download-btn {
    display: block;
    background-color: #2ecc71;
    color: white;
    text-decoration: none;
    text-align: center;
    padding: 12px;
    border-radius: 4px;
    margin-top: 15px;
    transition: background-color 0.3s;
}

.download-btn:hover {
    background-color: #27ae60;
}

footer {
    text-align: center;
    margin-top: 40px;
    color: #bdc3c7;
    font-size: 14px;
}